<!doctype html>
<html>
  <head>
    <meta charset=utf-8>
    <title>Tests for the effect of setting a CSS transition's
           Animation.startTime</title>
    <style>

.animated-div {
  margin-left: 100px;
  transition: margin-left 1000s linear 1000s;
}

    </style>
    <script src="../testcommon.js"></script>
  </head>
  <body>
    <script type="text/javascript">

'use strict';

// TODO: Once the computedTiming property is implemented, add checks to the
// checker helpers to ensure that computedTiming's properties are updated as
// expected.
// See https://bugzilla.mozilla.org/show_bug.cgi?id=1108055


const ANIM_DELAY_MS = 1000000; // 1000s
const ANIM_DUR_MS = 1000000; // 1000s

/**
 * These helpers get the value that the startTime needs to be set to, to put an
 * animation that uses the above ANIM_DELAY_MS and ANIM_DUR_MS values into the
 * middle of various phases or points through the active duration.
 */
function startTimeForBeforePhase(timeline) {
  return timeline.currentTime - ANIM_DELAY_MS / 2;
}
function startTimeForActivePhase(timeline) {
  return timeline.currentTime - ANIM_DELAY_MS - ANIM_DUR_MS / 2;
}
function startTimeForAfterPhase(timeline) {
  return timeline.currentTime - ANIM_DELAY_MS - ANIM_DUR_MS - ANIM_DELAY_MS / 2;
}
function startTimeForStartOfActiveInterval(timeline) {
  return timeline.currentTime - ANIM_DELAY_MS;
}
function startTimeForFiftyPercentThroughActiveInterval(timeline) {
  return timeline.currentTime - ANIM_DELAY_MS - ANIM_DUR_MS * 0.5;
}
function startTimeForEndOfActiveInterval(timeline) {
  return timeline.currentTime - ANIM_DELAY_MS - ANIM_DUR_MS;
}


// Expected computed 'margin-left' values at points during the active interval:
// When we assert_between_inclusive using these values we could in theory cause
// intermittent failure due to very long delays between paints, but since the
// active duration is 1000s long, a delay would need to be around 100s to cause
// that. If that's happening then there are likely other issues that should be
// fixed, so a failure to make us look into that seems like a good thing.
const INITIAL_POSITION = 100;
const TEN_PCT_POSITION = 110;
const FIFTY_PCT_POSITION = 150;
const END_POSITION = 200;

// The terms used for the naming of the following helper functions refer to
// terms used in the Web Animations specification for specific phases of an
// animation. The terms can be found here:
//
//   https://w3c.github.io/web-animations/#animation-effect-phases-and-states
//
// Note the distinction between the "animation start time" which occurs before
// the start delay and the start of the active interval which occurs after it.

// Called when the ready Promise's callbacks should happen
function checkStateOnReadyPromiseResolved(animation)
{
  assert_less_than_equal(animation.startTime, animation.timeline.currentTime,
    'Animation.startTime should be less than the timeline\'s ' +
    'currentTime on the first paint tick after animation creation');

  assert_equals(animation.playState, 'running',
    'Animation.playState should be "running" on the first paint ' +
    'tick after animation creation');

  var div = animation.effect.target;
  var marginLeft = parseFloat(getComputedStyle(div).marginLeft);
  assert_equals(marginLeft, INITIAL_POSITION,
                'the computed value of margin-left should be unaffected ' +
                'by an animation with a delay on ready Promise resolve');
}

// Called when startTime is set to the time the active interval starts.
function checkStateAtActiveIntervalStartTime(animation)
{
  // We don't test animation.startTime since our caller just set it.

  assert_equals(animation.playState, 'running',
    'Animation.playState should be "running" at the start of ' +
    'the active interval');

  var div = animation.effect.target;
  var marginLeft = parseFloat(getComputedStyle(div).marginLeft);
  assert_between_inclusive(marginLeft, INITIAL_POSITION, TEN_PCT_POSITION,
    'the computed value of margin-left should be close to the value at the ' +
    'beginning of the animation');
}

function checkStateAtFiftyPctOfActiveInterval(animation)
{
  // We don't test animation.startTime since our caller just set it.

  var div = animation.effect.target;
  var marginLeft = parseFloat(getComputedStyle(div).marginLeft);
  assert_equals(marginLeft, FIFTY_PCT_POSITION,
    'the computed value of margin-left should be half way through the ' +
    'animation at the midpoint of the active interval');
}

// Called when startTime is set to the time the active interval ends.
function checkStateAtActiveIntervalEndTime(animation)
{
  // We don't test animation.startTime since our caller just set it.

  assert_equals(animation.playState, 'finished',
    'Animation.playState should be "finished" at the end of ' +
    'the active interval');

  var div = animation.effect.target;
  var marginLeft = parseFloat(getComputedStyle(div).marginLeft);
  assert_equals(marginLeft, END_POSITION,
    'the computed value of margin-left should be the final transitioned-to ' +
    'value at the end of the active duration');
}

test(function(t)
{
  var div = addDiv(t, {'class': 'animated-div'});
  flushComputedStyle(div);
  div.style.marginLeft = '200px'; // initiate transition

  var animation = div.getAnimations()[0];
  assert_equals(animation.startTime, null, 'startTime is unresolved');
}, 'startTime of a newly created transition is unresolved');


test(function(t)
{
  var div = addDiv(t, {'class': 'animated-div'});
  flushComputedStyle(div);
  div.style.marginLeft = '200px'; // initiate transition

  var animation = div.getAnimations()[0];
  var currentTime = animation.timeline.currentTime;
  animation.startTime = currentTime;
  assert_approx_equals(animation.startTime, currentTime, 0.0001, // rounding error
    'Check setting of startTime actually works');
}, 'Sanity test to check round-tripping assigning to new animation\'s ' +
   'startTime');


async_test(function(t) {
  var div = addDiv(t, {'class': 'animated-div'});
  var eventWatcher = new EventWatcher(t, div, 'transitionend');

  flushComputedStyle(div);
  div.style.marginLeft = '200px'; // initiate transition

  var animation = div.getAnimations()[0];

  animation.ready.then(t.step_func(function() {
    checkStateOnReadyPromiseResolved(animation);

    animation.startTime = startTimeForStartOfActiveInterval(animation.timeline);
    checkStateAtActiveIntervalStartTime(animation);

    animation.startTime =
      startTimeForFiftyPercentThroughActiveInterval(animation.timeline);
    checkStateAtFiftyPctOfActiveInterval(animation);

    animation.startTime = startTimeForEndOfActiveInterval(animation.timeline);
    return eventWatcher.wait_for('transitionend');
  })).then(t.step_func(function() {
    checkStateAtActiveIntervalEndTime(animation);
  })).catch(t.step_func(function(reason) {
    assert_unreached(reason);
  })).then(function() {
    t.done();
  });
}, 'Skipping forward through animation');


test(function(t) {
  var div = addDiv(t, {'class': 'animated-div'});
  var eventWatcher = new EventWatcher(t, div, 'transitionend');

  flushComputedStyle(div);
  div.style.marginLeft = '200px'; // initiate transition

  var animation = div.getAnimations()[0];

  // Unlike in the case of CSS animations, we cannot skip to the end and skip
  // backwards since when we reach the end the transition effect is removed and
  // changes to the Animation object no longer affect the element. For
  // this reason we only skip forwards as far as the 90% through point.

  animation.startTime =
    startTimeForFiftyPercentThroughActiveInterval(animation.timeline);
  checkStateAtFiftyPctOfActiveInterval(animation);

  animation.startTime = startTimeForStartOfActiveInterval(animation.timeline);

  // Despite going backwards from being in the active interval to being before
  // it, we now expect an 'animationend' event because the animation should go
  // from being active to inactive.
  //
  // Calling checkStateAtActiveIntervalStartTime will check computed style,
  // causing computed style to be updated and the 'transitionend' event to
  // be dispatched synchronously. We need to call waitForEvent first
  // otherwise eventWatcher will assert that the event was unexpected.
  eventWatcher.wait_for('transitionend').then(function() {
    t.done();
  });
  checkStateAtActiveIntervalStartTime(animation);
}, 'Skipping backwards through transition');


async_test(function(t) {
  var div = addDiv(t, {'class': 'animated-div'});

  flushComputedStyle(div);
  div.style.marginLeft = '200px'; // initiate transition

  var animation = div.getAnimations()[0];

  var storedCurrentTime;

  animation.ready.then(t.step_func(function() {
    storedCurrentTime = animation.currentTime;
    animation.startTime = null;
    return animation.ready;
  })).catch(t.step_func(function(reason) {
    assert_unreached(reason);
  })).then(t.step_func(function() {
    assert_equals(animation.currentTime, storedCurrentTime,
      'Test that hold time is correct');
    t.done();
  }));
}, 'Setting startTime to null');


async_test(function(t) {
  var div = addDiv(t, {'class': 'animated-div'});

  flushComputedStyle(div);
  div.style.marginLeft = '200px'; // initiate transition

  var animation = div.getAnimations()[0];

  animation.ready.then(t.step_func(function() {
    var savedStartTime = animation.startTime;

    assert_not_equals(animation.startTime, null,
      'Animation.startTime not null on ready Promise resolve');

    animation.pause();
    return animation.ready;
  })).then(t.step_func(function() {
    assert_equals(animation.startTime, null,
      'Animation.startTime is null after paused');
    assert_equals(animation.playState, 'paused',
      'Animation.playState is "paused" after pause() call');
  })).catch(t.step_func(function(reason) {
    assert_unreached(reason);
  })).then(function() {
    t.done();
  });
}, 'Animation.startTime after paused');

done();
    </script>
  </body>
</html>
